Author Topic: SpaceX F9 : CRS SpX-19 : December 5, 2019 - DISCUSSION (Read 61157 times)

CorvusCorax · « **Reply #40 on:** 11/27/2019 07:56 am »

Quote from: whitelancer64 on 11/26/2019 02:30 pm

Quote from: Elthiryel on 11/26/2019 02:20 pm
Apart from the visual confirmation, Space.com article also states that the new booster (1059.1) is going to be used for this mission.

https://www.space.com/spacex-space-station-science-crs19-cargo.html

How can you tell from that picture? There's all kinds of atmospheric distortion.

Is it shiney white?

SpaceX doesn't repaintb used boosters, they are all sooty and black-ish.

capoman · « **Reply #41 on:** 11/27/2019 12:51 pm »

My suspicion of why they are using a new booster might be as simple as the fact that SpaceX plans to have so many Starlink flights next year in addition to their normal payloads, they are increasing their overall stock of boosters, and giving their biggest customer a new one to use.

Rondaz · « **Reply #42 on:** 11/27/2019 08:41 pm »

The @SpaceX #Dragon resupply ship is targeted to launch Dec. 4 and arrive at the station on Dec. 7. @NASA TV is broadcasting all the activities live.

https://twitter.com/Space_Station/status/1199776056221327360

whitelancer64 · « **Reply #43 on:** 11/27/2019 09:04 pm »

Quote from: CorvusCorax on 11/27/2019 07:56 am

Quote from: whitelancer64 on 11/26/2019 02:30 pm
Quote from: Elthiryel on 11/26/2019 02:20 pm
Apart from the visual confirmation, Space.com article also states that the new booster (1059.1) is going to be used for this mission.

https://www.space.com/spacex-space-station-science-crs19-cargo.html

How can you tell from that picture? There's all kinds of atmospheric distortion.

Is it shiney white?

SpaceX doesn't repaintb used boosters, they are all sooty and black-ish.

In the referred-to picture, from this tweet,

https://twitter.com/stevenyoungsfn/status/1199330137415786496

the booster was still horizontal and backlit by the sky. It looked dark, and could easily have been sooty.

There was a post https://forum.nasaspaceflight.com/index.php?topic=49550.msg2019416#msg2019416

about this tweet,

https://twitter.com/SpaceflightNow/status/1199343513743155200

That picture was all distorted from the atmosphere.

ThomasGadd · « **Reply #44 on:** 11/27/2019 10:06 pm »

It seem's NASA isn't ready for a thrice flow booster (yet)?

FutureSpaceTourist · « **Reply #45 on:** 11/28/2019 01:44 pm »

CRS-19 related or is timing coincidental?

https://twitter.com/gregscott_photo/status/1200048373992230912

Quote

Go Discovery showed up this morning & docked beside Go Quest, Searcher & Navigator. The deck is empty and I am not sure of the reason for the reunion. Could it be in conjunction with CRS-19 nxt week? 1st time I have ever gotten all these sisters at once. #SpaceX #ElonMusk #Space

https://twitter.com/gregscott_photo/status/1200055435002175488

Quote

Go Discovery showed up early this morning, the deck is empty and I am not sure of the reason for the trip but there is a reason for it being here on Thanksgiving Day. Could it be in conjunction with CRS-19 next week? #SpaceX #ElonMusk #Space

FutureSpaceTourist · « **Reply #46 on:** 11/30/2019 06:17 pm »

https://twitter.com/gregscott_photo/status/1200851168685121542

Quote

SPACEX FLEET: OCISLY is getting a clean up today after sitting idle for a couple of weeks now. Eagerly anticipating the recovery of booster B1059.1 from next weeks #CRS19 mission to the ISS. I am still not sure why it was not designated as a LZ1 landing but... #SpaceX #Space

https://twitter.com/therealjonvh/status/1200854582051643392

Quote

It would appear that GoDiscovery is being outfitted with things. #SpaceXFleet

FutureSpaceTourist · « **Reply #47 on:** 11/30/2019 06:54 pm »

Looks like Go Discovery is nothing to do with CRS-19 but may instead be shipping things to South Texas:

https://forum.nasaspaceflight.com/index.php?topic=48893.msg2020768#msg2020768

gtae07 · « **Reply #48 on:** 12/01/2019 12:06 am »

Could SpaceX be doing a recovery at sea because LZ1 isn’t cleaned up from the Crew Dragon static fire a little while back (it might be cleaned up, I’m just speculating)? Of course, if that were the case I’d expect the landing right off shore, not further out...

Orbiter · « **Reply #49 on:** 12/01/2019 12:29 am »

If it were a simple issue of the pad being unavailable then SpaceX would have placed OCISLY a few dozen kilometers off shore like for CRS-17. Clearly, something regarding CRS-19 has lead SpaceX to decide they need the extra prop margin.

scr00chy · « **Reply #50 on:** 12/01/2019 12:40 am »

Wow, I've just checked and the launch date of December 4 first appeared in early February 2019 and hasn't moved since then. That's pretty incredible.

Rondaz · « **Reply #51 on:** 12/01/2019 01:50 am »

Weather is 90% go for the #SpaceX #CRS19 launch to the International Space Station on December 4th. Liftoff is scheduled for 12:51 EST (17:51 UTC).

https://twitter.com/nextspaceflight/status/1200904755368755200

su27k · « **Reply #52 on:** 12/01/2019 02:42 am »

Quote from: Orbiter on 12/01/2019 12:29 am

If it were a simple issue of the pad being unavailable then SpaceX would have placed OCISLY a few dozen kilometers off shore like for CRS-17. Clearly, something regarding CRS-19 has lead SpaceX to decide they need the extra prop margin.

There's speculation on reddit that this is a dress rehearsal for DM-2.

Rondaz · « **Reply #53 on:** 12/01/2019 06:38 pm »

Tug Hwak is hooked up and Port Canaveral tug Christine S is ready with the assist. It is go time for OCISLY. Let's get this mission started!

https://twitter.com/julia_bergeron/status/1201211961729568769

ugordan · « **Reply #54 on:** 12/01/2019 07:52 pm »

Quote from: su27k on 12/01/2019 02:42 am

Quote from: Orbiter on 12/01/2019 12:29 am
If it were a simple issue of the pad being unavailable then SpaceX would have placed OCISLY a few dozen kilometers off shore like for CRS-17. Clearly, something regarding CRS-19 has lead SpaceX to decide they need the extra prop margin.

There's speculation on reddit that this is a dress rehearsal for DM-2.

What kind of dress rehearsal, they already performed the DM-1 launch profile with downrange landing? What would be rehearsed with a cargo Dragon?

LouScheffer · « **Reply #55 on:** 12/02/2019 01:45 am »

Quote from: ugordan on 12/01/2019 07:52 pm

Quote from: su27k on 12/01/2019 02:42 am
Quote from: Orbiter on 12/01/2019 12:29 am
If it were a simple issue of the pad being unavailable then SpaceX would have placed OCISLY a few dozen kilometers off shore like for CRS-17. Clearly, something regarding CRS-19 has lead SpaceX to decide they need the extra prop margin.

There's speculation on reddit that this is a dress rehearsal for DM-2.

What kind of dress rehearsal, they already performed the DM-1 launch profile with downrange landing? What would be rehearsed with a cargo Dragon?

Well, for crewed missions they would want all margin possible, which means downrange landings. So perhaps the DM-1 rehearsal did not correctly test something they want tested, or otherwise did not hit all the objectives. So they are trying again. Obviously this is just a guess...

FutureSpaceTourist · « **Reply #56 on:** 12/03/2019 12:46 pm »

https://twitter.com/marco_langbroek/status/1201843681852055552

Quote

New blog post: "An interesting CRS-19 Falcon upper stage deorbit area"
https://sattrackcam.blogspot.com/2019/12/an-interesting-crs-19-falcon-upper.html?m=1
@SSC_NL

Key point:

Quote

The Maritime Broadcast Warning above suggests that the CRS-19 upper stage deorbit happens much later, about 5.5 hours or 3.5 revolutions after launch. In addition, the area is shifted southwards compared to the CRS-19 ground track, indicating a deorbit from an orbital inclination clearly higher than the 51.6 degrees orbital inclination of the DRAGON. In fact, it fits an orbital inclination in the order of of 57-58 degrees, i.e. some 5 degrees higher in inclination.

Comga · « **Reply #57 on:** 12/03/2019 01:01 pm »

The elapsed time for the CRS-19 second stage reentry is not much shorter than the time to coast from LEO to GEO.
If and when I get the time it seems obvious to compare the delta-V of that ~6 degree plane change (guess:0.6 km/sec) to a GTO injection burn.
If we see a second stage deorbit burn it would indicate that this is a test of direct injection into GEO. Somewhat like the first Heavy launch.

Elthiryel · « **Reply #58 on:** 12/03/2019 01:53 pm »

NASA is holding the prelaunch news conference at 4 PM Eastern today, featuring Jessica Jensen from SpaceX, so hopefully someone asks about the exact reasons of the deorbit profile and ASDS landing.

nacnud · « **Reply #59 on:** 12/03/2019 01:55 pm »

This test might also explain why the first stage is landing on a drone ship rather than back on land.